In various species of frogs, males produce successive calls to attract conspecific females as well as to claim their own territories towards other males. In general, many male frogs chorus in the same site, making it difficult for us to localize and discriminate their calls. We are developing a novel method using a sound-imaging device named Firely for the localization of calls of male frogs. A unit of the device consists of a light emitting diode and a microphone, and is illuminated when capturing nearby sounds. We deployed dozens of the devices in natural habitat of male frogs and recorded the illumination patterns with a video camera. The illumination patterns allow us to localize and discriminate calls of male frogs in their natural habitat. In this presentation, I will explain the sound-imaging device (Mizumoto et.al., J. Comp. Physiol., 2011), and show that our method works when recording the choruses of male frogs (Aihara et.al., Sci. Rep., 2014). Then, I will talk about the extended projects of the sound-imaging device on acoustic preference of frog-biting midges (Aihara et al., Ethology, 2016) as well as the preference of female frogs (Aihara et al., Sci. Rep., 2017).